[ https://issues.apache.org/jira/browse/HADOOP-16214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16815695#comment-16815695 ]
Eric Yang commented on HADOOP-16214:
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Patch 10 is based on patch 8 with rename of serviceName to componentsName, and added hostname checking for second part of the components name for simple security.
> Kerberos name implementation in Hadoop does not accept principals with more than two components
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-16214
> URL: https://issues.apache.org/jira/browse/HADOOP-16214
> Project: Hadoop Common
> Issue Type: Bug
> Components: auth
> Reporter: Issac Buenrostro
> Priority: Major
> Attachments: HADOOP-16214.001.patch, HADOOP-16214.002.patch, HADOOP-16214.003.patch, HADOOP-16214.004.patch, HADOOP-16214.005.patch, HADOOP-16214.006.patch, HADOOP-16214.007.patch, HADOOP-16214.008.patch, HADOOP-16214.009.patch, HADOOP-16214.010.patch
>
>
> org.apache.hadoop.security.authentication.util.KerberosName is in charge of converting a Kerberos principal to a user name in Hadoop for all of the services requiring authentication.
> Although the Kerberos spec ([https://web.mit.edu/kerberos/krb5-1.5/krb5-1.5.4/doc/krb5-user/What-is-a-Kerberos-Principal_003f.html]) allows for an arbitrary number of components in the principal, the Hadoop implementation will throw a "Malformed Kerberos name:" error if the principal has more than two components (because the regex can only read serviceName and hostName).
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